chore: add attachments/ to gitignore

refactor: update folder structure and adjust output paths

refactor: implement 3-tier folder naming convention

chore: ignore entire docs/ folder (not in git)

refactor: move project template to ref/ folder

refactor: rename runtime folders with underscore prefix

feat: standardize logging with console + file separation

feat: system error field, calculator fix, target task IDs, course vs GAIA docs

Remove binary test images and update .gitignore

Phase 0 Prep: Cache restructure, Vision investigation, HF integration plan

Stage 1: Foundation Setup - LangGraph agent with isolated environment